Surface cracking on Σ3, Σ9 CSL and random grain boundaries in helium implanted 316L austenitic stainless steel
Surface cracking on Σ3, Σ9 CSL and random grain boundaries in helium implanted 316L austenitic stainless steel
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DOI：
10.1016/j.jnucmat.2012.08.019
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发表时间：
2013-01-01
影响因子：
3.1
通讯作者：
Kinoshita, H.
中科院分区：
文献类型：
--
作者：
Sakaguchi, N.;Ohguchi, Y.;Kinoshita, H.
采用高压电子显微镜原位退火、扫描电镜和透射电镜观察等方法，研究了氦离子注入316L奥氏体不锈钢晶界表面开裂与晶界性质的关系。在973 K退火过程中，观察到氦泡在随机晶界上的形核和生长。退火后，在随机晶界和一些重合位置晶格（CSL）边界处观察到表面开裂，这是因为在这些晶界处氦泡的形成和破裂。在多面CSL边界处，表面裂纹仅发生在一个边界小平面上。这表明孪晶晶界和纯倾斜Sigma 9 CSL晶界由于其低的边界能而显示出最高的抗开裂性。(c)2012爱思唯尔有限公司版权所有。
The relationship between surface cracking at grain boundaries and the grain boundary nature in helium implanted 316L austenitic stainless steel was investigated by in situ annealing in a high-voltage electron microscope, and by SEM and TEM observations. The nucleation and growth of helium bubbles at a random grain boundary was observed during annealing up to 973 K. After annealing, surface cracking was observed at the random grain boundaries and some coincidence site lattice (CSL) boundaries because of the formation and rupture of the helium bubbles at these grain boundaries. At the faceted CSL boundaries, surface cracking occurred only on one boundary facet plane. This indicates that the twin boundary and pure tilt Sigma 9 CSL boundary show the highest resistance to cracking because of their low boundary energies. (c) 2012 Elsevier B.V. All rights reserved.